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cifs: copy_file_range needs to strip setuid bits and update timestamps 

cifs has both source and destination inodes locked throughout the copy.
Like ->write_iter(), we update mtime and strip setuid bits of destination
file before copy and like ->read_iter(), we update atime of source file
after copy.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Amir Goldstein 2019-06-10 20:36:57 +03:00 committed by Steve French
parent 7e5a70ad88
commit bf3c90ee1e
1 changed files with 8 additions and 3 deletions
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11
fs/cifs/cifsfs.c
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@ -1104,6 +1104,10 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
goto out;
}
rc = -EOPNOTSUPP;
if (!target_tcon->ses->server->ops->copychunk_range)
goto out;
/*
* Note: cifs case is easier than btrfs since server responsible for
* checks for proper open modes and file type and if it wants
@ -1115,11 +1119,12 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
/* should we flush first and last page first */
truncate_inode_pages(&target_inode->i_data, 0);
if (target_tcon->ses->server->ops->copychunk_range)
rc = file_modified(dst_file);
if (!rc)
rc = target_tcon->ses->server->ops->copychunk_range(xid,
smb_file_src, smb_file_target, off, len, destoff);
else
rc = -EOPNOTSUPP;
file_accessed(src_file);
/* force revalidate of size and timestamps of target file now
* that target is updated on the server